What will cause motor oil to blow out of a dipstick tube?
By Gene Paulk from Live Oak, FL
There is oil pressure inside of the engine. Do you recall the old days when every car had a oil pressure gauge on the dash board? Nowadays, a light comes on when the oil pressure is low. So if the oil dip stick is not secure the pressure of the oil in the engine (when the engine is running of course), will force the oil out of any low pressure area, in this case the dip stick tube.
It is likely caused by blow-by, be sure the oil level is not over full as well. It is a possibility the PCV Valve is not working properly and causing the pressure buildup as well, replace the PCV Valve first. This also may be caused by Blow-by that is caused by broken or stuck lower compression rings in turn causing the pressure to build up inside the engine, if replacing the PCV Valves doesn't stop it then get some top engine cleaner and remove all spark plugs and poor the whole can of fluid inside the spark plug holes equal amount to each cylinder, let it sit over night (spark plugs left out).
If all else fails, check the bottom of intake manifold for a hole burned through it. I had a oil blowing 350 and that was my problem.
If you have excessive air forcefully coming out you dip stick, it's "blow by." I bet if you take and crack open the oil fill cap it would make a mess blowing oil all over too. Now all engines have some degree of blow by. Here is some of the possible issues, 1. Worn rings on one or more cylinders. 2. Values (intake and/or exhaust) not seating good in the cylinder head.
Best think you can do is a cylinder pressure check. I think you can get a loaner from one of the auto stores or just buy one. Get you a Haynes and Clitons for your vehicle. And it will tell you how to do it. I say get both books/manuals as the both have better topics, graphics that the other leaves out
Obviously it's the compression blowing in the oil pan, meaning your piston rings are gone, most of the times that happens when your engine overheats and the compression rings get ceased on the piston groove
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I recently completely rebuilt my engine with new pistons and all, but before this I had oil coming out of my dipstick tube when I remove the dipstick while the engine is running. This problem continued even after the rebuild. What could be the cause of this?
Please help me.
You might have excess pressure causing the oil to come out of the dipstick
Something is definitely wrong, thats for sure. PCV valve maybe?
yeah it looks like you need to work on your joints and other places where the moving parts interconnect.
I don't have experience with motors per se but in other applications such as pipes/plumbing, this sounds like a washer problem or some other thing to create a seal to prevent spillage from happening